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![OSDC 2014
class php5(
$has_fcgi = false,
$has_apache = false,
$role = undef
) {
if ($has_fcgi)
package { 'php5-cli' : ensure => installed }
}
if ($has_apache) {
package { 'php5-apache' : ensure => installed }
}
if ($role == 'web-app-c') {
package { 'php5-web-app-c-special-module' }
file { '/etc/php5/php.ini' :
source => 'puppet:///modules/php5/php.ini-web-app-c',
require => Package[php-fcgi]
}
}](https://image.slidesharecdn.com/olemichaelissnkermplermakeitsolid-softwarearchitectureforsys-admins-140424103226-phpapp01/85/OSDC-2014-Ole-Michaelis-Sonke-Rumpler-Make-it-SOLID-Software-Architecture-for-System-Administrators-16-320.jpg)
![OSDC 2014
class php5(
$has_fcgi = false,
$has_apache = false,
$role = undef
) {
if ($has_fcgi)
package { 'php5-cli' : ensure => installed }
}
if ($has_apache) {
package { 'php5-apache' : ensure => installed }
}
if ($role == 'web-app-c') {
package { 'php5-web-app-c-special-module' }
file { '/etc/php5/php.ini' :
source => 'puppet:///modules/php5/php.ini-web-app-c'
require => Package[php-fcgi]
}
}
}](https://image.slidesharecdn.com/olemichaelissnkermplermakeitsolid-softwarearchitectureforsys-admins-140424103226-phpapp01/85/OSDC-2014-Ole-Michaelis-Sonke-Rumpler-Make-it-SOLID-Software-Architecture-for-System-Administrators-20-320.jpg)
![OSDC 2014
if ($lighttpd) {
package { 'php5-cgi': }
configdir { '/etc/php5/cgi': require => Package['php5-cgi'] }
configdir { '/etc/php5/cgi/conf.d': require => Package['php5-cgi'] }
if ($testserver) {
configfile { '/etc/php5/cgi/php.ini': sourcename => 'php5/cgi/php.ini-testserver',
require => Package['php5-cgi'] }
} else {
if ($cms ) {
configfile { '/etc/php5/cgi/php.ini': sourcename => 'php5/cgi/php.ini-cms',
require => Package['php5-cgi'] }
} else {
if ($mgmt ) {
configfile { '/etc/php5/cgi/php.ini': sourcename => 'php5/cgi/php.ini-mgmt',
require => Package['php5-cgi'] }
} else {
if ($lc ) {
configfile { '/etc/php5/cgi/php.ini': sourcename => 'php5/cgi/php.ini-lc.
jimdo.com', require => Package['php5-cgi'] }
} else {
configfile { '/etc/php5/cgi/php.ini': sourcename => 'php5/cgi/php.ini',
require => Package['php5-cgi'] }
}
}
}
}
configfile { '/etc/php5/cgi/conf.d/pdo.ini': sourcename => 'php5/cgi/conf.d/pdo.ini',
require => Package['php5-cgi'] }
}](https://image.slidesharecdn.com/olemichaelissnkermplermakeitsolid-softwarearchitectureforsys-admins-140424103226-phpapp01/85/OSDC-2014-Ole-Michaelis-Sonke-Rumpler-Make-it-SOLID-Software-Architecture-for-System-Administrators-22-320.jpg)
![OSDC 2014
“programs […] are changed by adding
new code, rather than by changing
existing code”
Open Close
Principle](https://image.slidesharecdn.com/olemichaelissnkermplermakeitsolid-softwarearchitectureforsys-admins-140424103226-phpapp01/85/OSDC-2014-Ole-Michaelis-Sonke-Rumpler-Make-it-SOLID-Software-Architecture-for-System-Administrators-33-320.jpg)
![OSDC 2014
?
class php5::fcgi($role = undef) {
if ($role == 'web-app-c') {
package { 'php5-web-app-c-special-module' }
file { '/etc/php5/php.ini' :
source =>
'puppet:///modules/php5/php.ini-web-app-c',
require => Package[php-fcgi]
}
}
}](https://image.slidesharecdn.com/olemichaelissnkermplermakeitsolid-softwarearchitectureforsys-admins-140424103226-phpapp01/85/OSDC-2014-Ole-Michaelis-Sonke-Rumpler-Make-it-SOLID-Software-Architecture-for-System-Administrators-41-320.jpg)
![OSDC 2014
class php5::fcgi($include_after_package_install = undef) {
package { 'php5-fcgi' : ensure => installed }
if ($include_after_package_install)
include $include_after_package_install
Package['php5-fcgi'] -> Class[$include_after_package_install]
}
}
2. Make the special case pluggable and
reusable.
2a. And name it abstract.](https://image.slidesharecdn.com/olemichaelissnkermplermakeitsolid-softwarearchitectureforsys-admins-140424103226-phpapp01/85/OSDC-2014-Ole-Michaelis-Sonke-Rumpler-Make-it-SOLID-Software-Architecture-for-System-Administrators-44-320.jpg)
![OSDC 2014
define php5::specialconfig(
$ensure = present,
$sapi,
$module,
$key,
$value,
$section = undef,
$path = '/etc/php5/%s/conf.d/%s.ini'
) {
ini_setting { $title:
ensure => $ensure,
path => sprintf($path, $sapi, $module),
section => $section,
setting => $key,
value => $value,
require => Package["php5-${sapi}"]
}
}](https://image.slidesharecdn.com/olemichaelissnkermplermakeitsolid-softwarearchitectureforsys-admins-140424103226-phpapp01/85/OSDC-2014-Ole-Michaelis-Sonke-Rumpler-Make-it-SOLID-Software-Architecture-for-System-Administrators-48-320.jpg)
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OSDC 2014: Ole Michaelis & Sönke Rümpler: Make it SOLID - Software Architecture for System Administrators
The document presents a talk on effective software architecture for system administrators, emphasizing the importance of principles such as S.O.L.I.D. and configuration management. It discusses practical examples using Puppet for managing PHP applications and highlights the challenges of maintaining clean and manageable code. The presentation also touches on testing and ensuring reliability in software deployments while incorporating best practices in software design.
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OSDC 2014: Ole Michaelis & Sönke Rümpler: Make it SOLID - Software Architecture for System Administrators
- 1. Ole Michaelis &Sönke Ruempler | Jimdo Make it SOLID Software Architecture for System Administrators
- 2. OSDC 2014 Ole Michaelis “OpenSource Rockstar” @CodeStars github.com/nesQuick codestars.eu
- 3. OSDC 2014 Sönke Ruempler “Chief TrollingOfficer” @s0enke github.com/s0enke ruempler.eu
- 4.
- 5. OSDC 2014 because infrastructuredevelopment is neither a Jenga game! S.O.L.I.D
- 6. OSDC 2014 a littlepoll! http://images.fineartamerica.com/images-medium-large/live-long-mr-spock-tobias-woelki.jpg
- 7.
- 8. OSDC 2014 S OL I D
- 9.
- 10.
- 11.
- 12. OSDC 2014 software architecture VS. 36years >2000 years
- 13.
- 14. OSDC 2014 node web-1{ $role = 'web-app-a' $has_apache = true; include php5 } node web-2 { $role = 'web-app-b' $has_fcgi=true include php5 } # has both enabled, but needs a special config node web-3 { $role = 'web-app-c' $has_fcgi=true $has_apache=true include php5 } Web App 1 Web App 2 Web App 3
- 15. OSDC 2014 class php5{ if ($::has_fcgi) package { 'php5-cli' : ensure => installed } } if ($::has_apache) { package { 'php5-apache' : ensure => installed } } if ($::role == 'web-app-c') package { 'php5-web-app-c-special-module' } file { '/etc/php5/php.ini' : source => 'puppet:///modules/php5/php.ini-web-app-c' } } } Global variable! Out of Context! No abstraction
- 16. OSDC 2014 class php5( $has_fcgi= false, $has_apache = false, $role = undef ) { if ($has_fcgi) package { 'php5-cli' : ensure => installed } } if ($has_apache) { package { 'php5-apache' : ensure => installed } } if ($role == 'web-app-c') { package { 'php5-web-app-c-special-module' } file { '/etc/php5/php.ini' : source => 'puppet:///modules/php5/php.ini-web-app-c', require => Package[php-fcgi] } }
- 17. OSDC 2014 node 'web-1'{ $role = 'web-app-a' $has_apache = true class { 'php5' : has_apache => true, role => 'web-app-a' } } node 'web-2' { $role = 'web-app-b' $has_fcgi = true class { 'php5' : has_fcgi => true, role => 'web-app-b' } } Injection! Injection!
- 18. OSDC 2014 Would yousolder a lamp directly to the electrical wiring in a wall? Dependency Inversion
- 19.
- 20. OSDC 2014 class php5( $has_fcgi= false, $has_apache = false, $role = undef ) { if ($has_fcgi) package { 'php5-cli' : ensure => installed } } if ($has_apache) { package { 'php5-apache' : ensure => installed } } if ($role == 'web-app-c') { package { 'php5-web-app-c-special-module' } file { '/etc/php5/php.ini' : source => 'puppet:///modules/php5/php.ini-web-app-c' require => Package[php-fcgi] } } }
- 21. OSDC 2014 Stuff tendsto get big Beware of god classes!
- 22. OSDC 2014 if ($lighttpd){ package { 'php5-cgi': } configdir { '/etc/php5/cgi': require => Package['php5-cgi'] } configdir { '/etc/php5/cgi/conf.d': require => Package['php5-cgi'] } if ($testserver) { configfile { '/etc/php5/cgi/php.ini': sourcename => 'php5/cgi/php.ini-testserver', require => Package['php5-cgi'] } } else { if ($cms ) { configfile { '/etc/php5/cgi/php.ini': sourcename => 'php5/cgi/php.ini-cms', require => Package['php5-cgi'] } } else { if ($mgmt ) { configfile { '/etc/php5/cgi/php.ini': sourcename => 'php5/cgi/php.ini-mgmt', require => Package['php5-cgi'] } } else { if ($lc ) { configfile { '/etc/php5/cgi/php.ini': sourcename => 'php5/cgi/php.ini-lc. jimdo.com', require => Package['php5-cgi'] } } else { configfile { '/etc/php5/cgi/php.ini': sourcename => 'php5/cgi/php.ini', require => Package['php5-cgi'] } } } } } configfile { '/etc/php5/cgi/conf.d/pdo.ini': sourcename => 'php5/cgi/conf.d/pdo.ini', require => Package['php5-cgi'] } }
- 23.
- 24.
- 25.
- 26.
- 27.
- 28. OSDC 2014 describe :node=> 'web-1' do it { should contain_package ('php5-fcgi') } end describe :node => 'web-2' do it { should contain_package ('php5-apache2' ) } end describe :node => 'web-3' do it { should contain_package ('php5-fcgi') } it { should contain_package ('php5-apache2' ) } end Test php5 class: Install Package ?
- 29. OSDC 2014 describe :class=> 'php5::fcgi' do it { should contain_package('php5-cli') } end describe :class => 'php5::apache' do it { should contain_package('php5-apache2') } end class php5::fgci { package { 'php5-cgi' : ensure => installed } } class php5::apache { package { 'php5-apache' : ensure => installed } }
- 30. OSDC 2014 Just becauseyou can, doesn’t mean you should! Single Responsibility
- 31. OSDC 2014 describe :node=> 'web-1' do it { should include_class('php5::fcgi') } it { should contain_package('php5-fcgi') } end describe :node => 'web-2' do it { should include_class('php5::apache') } it { should contain_package('php5-apache2') } end node web-1 { include php5::apache } node web-2 { include php5::fcgi } Tests Code
- 32.
- 33. OSDC 2014 “programs […]are changed by adding new code, rather than by changing existing code” Open Close Principle
- 34.
- 35. OSDC 2014 new requirements... now webapp 1 needs a second node node web-1 { $role = 'web-app-a' include php5::apache } node web-1a { $role = 'web-app-a' include php5::apache }
- 36.
- 37.
- 38. OSDC 2014 class role::web-app-a{ include php5::apache } node web-1 { include role::web-app- a } node web-1a { include role::web-app- a } Our new role! And nodes just include it!
- 39.
- 40.
- 41. OSDC 2014 ? class php5::fcgi($role= undef) { if ($role == 'web-app-c') { package { 'php5-web-app-c-special-module' } file { '/etc/php5/php.ini' : source => 'puppet:///modules/php5/php.ini-web-app-c', require => Package[php-fcgi] } } }
- 42. OSDC 2014 Don’t callus, we call you! Hollywood Principle
- 43. OSDC 2014 class role::web-app-c::special-php-stuff{ package { 'php5-web-app-c-special-module' } file { '/etc/php5/php.ini' : source => 'puppet:///modules/php5/php.ini-web-app-c' } } 1. Split out the special case into its own class.
- 44. OSDC 2014 class php5::fcgi($include_after_package_install= undef) { package { 'php5-fcgi' : ensure => installed } if ($include_after_package_install) include $include_after_package_install Package['php5-fcgi'] -> Class[$include_after_package_install] } } 2. Make the special case pluggable and reusable. 2a. And name it abstract.
- 45. OSDC 2014 class role::web-app-c{ include php5::apache class { 'php5::fcgi' : include_after_package_install => 'profile::web-app-c::special-php-stuff' } } 3. Pass the special case as dependency in our web-app-c.
- 46.
- 47. OSDC 2014 class profile::web-app-c::special-php-stuff{ package { 'php5-web-app-c-special-module' } file { '/etc/php5/php.ini' : source => 'puppet:///modules/php5/php.ini-web-app-c' } } ?
- 48. OSDC 2014 define php5::specialconfig( $ensure= present, $sapi, $module, $key, $value, $section = undef, $path = '/etc/php5/%s/conf.d/%s.ini' ) { ini_setting { $title: ensure => $ensure, path => sprintf($path, $sapi, $module), section => $section, setting => $key, value => $value, require => Package["php5-${sapi}"] } }
- 49.
- 50.
- 51. OSDC 2014 “puppet separatecode and data” I’m feeling lucky
- 52. OSDC 2014 # /etc/puppet/hieradata/web1.yaml --- classes: -profile::web-app-a # /etc/puppet/hieradata/web1a.yaml --- classes: - profile::web-app-a # /etc/puppet/hieradata/web2.yaml --- classes: - profile::web-app-c # /etc/puppet/hieradata/web3.yaml --- classes: - profile::web-app-c puppet-hiera example in YAML
- 53. OSDC 2014 node default{ hiera_include('classes') } node web-1 { include role::web-app-a } node web-1a { include role::web-app-a } node web-2 { include role::web-app-b } node web-3 { include role::web-app-c }
- 54. OSDC 2014 hiera AWS/Cloudformation LDAP DNS yourselfwritten stuff
- 55.
- 56.
- 57.
- 58. OSDC 2014 What about Iand L in SOLID?
- 59. OSDC 2014 You wantme to plug this in, where? Interface Segregation
- 60. OSDC 2014 If itlooks like a duck, quacks like a duck, but need batteries - you probably have the wrong abstraction! Liskov Substitution
- 61. OSDC 2014 S OL I D
- 62.
- 63. OSDC 2014 Structure yourcode!Node ProfileProfilesRole ProfileModules Resources
- 64. OSDC 2014 Puppet forge puppetmodule registry
- 65.
- 66.
- 67.
- 68.
- 69.
- 70.
- 71. OSDC 2014 *I ’mjust a blank slide*
- 72. OSDC 2014 Sources • http://www.slideshare.net/PuppetLabs/garethrushgrove-puppetconf •http://www.slideshare.net/PuppetLabs/alessandro-franceschi-new • https://github.com/jedi4ever/stop-the-fork • http://lostechies.com/derickbailey/2009/02/11/solid-development-principles-in-motivational- pictures/ • https://speakerdeck.com/jfryman/refactoring-puppet • http://www.clker.com/cliparts/e/2/a/d/1206574733930851359Ryan_Taylor_Green_Tick.svg.med. png • http://www.craigdunn.org/2012/05/239/ • http://cdn.slashgear.com/wp-content/uploads/2012/10/google-datacenter-tech-13.jpg • http://deviq.com/Media/Default/Article/Dont-Call-Us-Well-Call-You-Jun-2013.png • http://www.timeshighereducation.co.uk/Pictures/web/g/q/g/copy_paste_keyboard_button_450.jpg • http://sanremo.com.au/wp-content/uploads/2013/05/lasagna.jpg • http://4.bp.blogspot. com/_9kQQgQD35rY/SaV5p8YBGhI/AAAAAAAAAkg/HOvlhIo7yGI/s400/06_Red_Green_Refactor. JPG • http://www.thelolshop.com/wp-content/uploads/2012/11/20121126-101937.jpg •